“…We collect the result of each roll call vote for the 20-year period in each chamber of the Congress, and we record the individual votes for every member voting on the bill (or abstaining). We choose to start with the raw bill data, instead of using alternate, publicly available versions of the congressional roll call data (see, for example, the Voteview.com, as well as McCarty, Rosenthal, 1997, 2006;Poole and Rosenthal, 1985, 1997, 2007, among many others), or the Political Institutions and Public Choice (PIPC) House Roll Call Database (Aldrich, Brady, de Marchi, McDonald, Nyhan, Rohde, and Tofias, 2009), which classifies bills by issue type (but is harder to map to specific firms or industries), because our approach exploits the specific text of each piece of legislation and allows us to map bills to affected industries.…”